If you watch from Episode 310 to till marriage track, you will find a strong relationship between Aryan-Imlie based on trust and only trust. They both have seen each other in their worst phase of life. So their bond can not be compared to Imlie Madhav bond. Madhav is a good friend from her village.
PS: I don't know how makers will manage the show, if there is a separation track, without AryLie together, because AryLie is the only factor that keeps the audience hooked to the show and they have very few side characters to fill the screen